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Ion Electron Method

Balance the f...

Question

Balance the following equation by ion electron method:
$C r I_{3} + H_{2} O_{2} + O H^{-} \to C r O_{4}^{2 -} + I O_{4}^{-} + H_{2} O$ .

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Solution

Half reactions
$[C r I_{3} + 32 O H^{-} \to C r O_{4}^{2 -} + 3 I O_{4}^{-} + 16 H_{2} O + 27 e] \times 2$
$[H_{2} O_{2} + 2 e \to 2 O H^{-}] \times 27$
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$2 C r I_{3} + 27 H_{2} O_{2} + 10 O H^{-} \to 2 C r O_{4}^{2 -} + 6 I O_{4}^{-} + 32 H_{2} O$
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